1. A preparation method of basic nickel carbonate is characterized by comprising the following steps:

(1) adding a nickel sulfate solution into a reaction kettle, and then according to the content of nickel metal in the nickel sulfate solution: continuously adding the sodium carbonate solid into a reaction kettle according to the mass ratio of 1: 1.2-1: 1.4, wherein the adding time of the sodium carbonate solid is 50-70min, the stirring frequency is 110 +/-10 r/min, and the reaction temperature is controlled at 25-30 ℃ to obtain a solid material;

(2) and (2) pulping and washing the solid material obtained in the step (1), and quickly drying at high temperature to obtain the basic nickel carbonate, wherein the technological conditions of the high-temperature quick drying are as follows: the drying temperature is 200-.

2. The method for preparing basic nickel carbonate according to claim 1, wherein the concentration of the nickel sulfate solution in the step (1) is 80-120 g/L.

3. The method for preparing basic nickel carbonate according to claim 1, wherein the slurry washing in step (2) is carried out 2 times by pure water at a temperature of 20-30 ℃.

Background

Low nickel basic nickel carbonate [ Ni ]_x(OH)_yCO₃·zH₂O]The product is used as precursor material for various catalysts. The low-nickel basic nickel carbonate prepared by the existing process is positioned between dry powder and wet materials, has higher moisture content, is easy to generate caking in the material transferring process, is difficult to store and has short shelf life.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides the preparation method of the low-nickel basic nickel carbonate, which can effectively prevent the product from caking and prolong the storage time, and the active binding sites of the prepared low-nickel basic nickel carbonate are more dispersed when the prepared low-nickel basic nickel carbonate is dissolved.

The invention is realized by the following technical scheme.

A preparation method of basic nickel carbonate is characterized by comprising the following steps:

(1) adding a nickel sulfate solution into a reaction kettle, and then according to the content of nickel metal in the nickel sulfate solution: continuously adding the sodium carbonate solid into a reaction kettle according to the mass ratio of 1: 1.2-1: 1.4, wherein the adding time of the sodium carbonate solid is 50-70min, the stirring frequency is 110 +/-10 r/min, and the reaction temperature is controlled at 25-30 ℃ to obtain a solid material;

(2) and (2) pulping and washing the solid material obtained in the step (1), and quickly drying at high temperature to obtain the basic nickel carbonate, wherein the technological conditions of the high-temperature quick drying are as follows: the drying temperature is 200-.

Further, the concentration of the nickel sulfate solution in the step (1) is 80-120 g/L.

Further, the pulping washing in the step (2) is washing for 2 times by pure water at the temperature of 20-30 ℃.

The invention has the beneficial technical effects that the invention provides the preparation method of the basic nickel carbonate, the nickel content in the prepared basic nickel carbonate is controlled to be 30-35%, and the finished product is powdery; the sodium carbonate solid is directly reacted with the nickel sulfate solution without dissolution, so that water is saved; the proportion of free water in the prepared basic nickel carbonate is reduced by about 10 percent, and the basic nickel carbonate can be stored for more than 12 months.

Drawings

Fig. 1 is an SEM image of basic nickel carbonate prepared by the present invention.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

Example 1

A method for preparing basic nickel carbonate comprises the following steps:

(1) preparing raw materials: sodium carbonate solid, nickel sulfate solution with concentration of 80 g/L;

(2)16m³adding 10m into a reaction kettle³Nickel sulfate solution, according to the nickel content in the nickel sulfate solution: continuously adding the sodium carbonate solid into a reaction kettle according to the mass ratio of 1:1.20, wherein the adding time of the sodium carbonate solid is 70min, the stirring frequency is 105r/min, and the reaction temperature is controlled at 25 ℃ to obtain a solid material;

(3) and (3) pulping and washing the solid material obtained in the step (2), and quickly drying at high temperature to obtain the basic nickel carbonate, wherein the pulping and washing is carried out for 2 times at the temperature of 30 ℃ by adopting pure water, and the technological conditions of the high-temperature quick drying are as follows: the drying temperature is 220 ℃, and the feeding rate is 200 kg/h;

the finished product powder of basic nickel carbonate with 31.2 percent of nickel content is obtained, and the storage time is 13 months.

Example 2

A method for preparing basic nickel carbonate comprises the following steps:

(1) preparing raw materials: sodium carbonate solid, nickel sulfate solution with concentration of 120 g/L;

(2)16m³adding 8m into the reaction kettle³Nickel sulfate solution, according to the nickel content in the nickel sulfate solution: continuously adding sodium carbonate solid into a reaction kettle according to the mass ratio of 1:1.40, wherein the adding time of the sodium carbonate solid is 50min, the stirring frequency is 102r/min, and the reaction temperature is controlled at 30 ℃ to obtain a solid material;

(3) and (3) pulping and washing the solid material obtained in the step (2), and quickly drying at high temperature to obtain the basic nickel carbonate, wherein the pulping and washing is carried out for 2 times by adopting pure water at the temperature of 20 ℃, and the technological conditions of the high-temperature quick drying are as follows: the drying temperature is 200 ℃, and the feeding rate is 250 kg/h;

the finished product powder of the basic nickel carbonate with the nickel content of 30.6 percent is obtained, and the storage time is 18 months.

Example 3

A method for preparing basic nickel carbonate comprises the following steps:

(1) preparing raw materials: sodium carbonate solid, nickel sulfate solution with concentration of 100 g/L;

(2)16m³adding 10m into a reaction kettle³Nickel sulfate solution, according to the nickel content in the nickel sulfate solution: continuously adding the sodium carbonate solid into a reaction kettle according to the mass ratio of 1:1.30, wherein the adding time of the sodium carbonate solid is 60min, the stirring frequency is 119r/min, and the reaction temperature is controlled at 27 ℃ to obtain a solid material;

(3) and (3) pulping and washing the solid material obtained in the step (2), and quickly drying at high temperature to obtain the basic nickel carbonate, wherein the pulping and washing is carried out for 2 times at 25 ℃ by adopting pure water, and the technological conditions of the high-temperature quick drying are as follows: the drying temperature is 210 ℃, and the feeding rate is 230 kg/h;

the finished product powder of the basic nickel carbonate with the nickel content of 32.0 percent is obtained, and the storage time is 15 months.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention. It should be noted that other equivalent modifications can be made by those skilled in the art in light of the teachings of the present invention, and all such modifications can be made as are within the scope of the present invention.